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  <p>
    Reports conflicting resolved expressions.
  </p>
  <p>
    An expression (key / value) will be considered as conflicting in following situations:
  </p>
  <ul>
    <li>It's a key expression, and value expression of it is a (non-empty) clause which matches multiple CWT expressions.</li>
    <li>It's a value expression, and it is a (non-empty) clause which matches multiple CWT expressions.</li>
  </ul>
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